How do you say have a great day in sign language?

There isn't a single sign for "have a great day" in American Sign Language (ASL). Instead, it's expressed through a combination of signs and facial expressions. Here's how you can do it:

1. Sign "GOOD": Make a "G" handshape with your dominant hand and touch your forehead with your thumb, then bring your hand out in a gesture of "good".

2. Sign "DAY": Make a "D" handshape with your dominant hand and touch your chest, then move your hand out in front of you, as if you're describing a day.

3. Facial expression: Smile broadly and raise your eyebrows to convey "have a good day" in a positive and friendly way.

You can also add another sign for emphasis, such as:

* "ENJOY": Sign "enjoy" by making a "C" handshape with your dominant hand and bringing it towards your mouth, then move it out to the side.

Here's how the signs might look together:

* Sign "GOOD" -> Sign "DAY" -> Smile broadly and raise your eyebrows.

* Sign "GOOD" -> Sign "DAY" -> Sign "ENJOY" -> Smile broadly and raise your eyebrows.

Remember, sign language is visual and relies on facial expressions and body language as much as the signs themselves.